Per royal reporter Omid Scobie, Meghan joined Prince Harry, the Queen, and several other members of the royal family at a service at Westminster Abbey, on the Buckingham Palace balcony for a flyover, and a reception with servicemen and women.

On July 10, the Queen (joined by members of the Royal Family including Prince Harry, Prince William and Duchess Meghan) will attend events, including a @Wabbey service, to mark the 100th anniversary of the @RoyalAirForce??

For the day of celebrations, Meghan is wearing a black dress with a bateau neckline, which is reportedly by Dior. She paired the fit and flare design with a hat by Stephen Jones, Cartier earrings, and nude pumps.

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The whole look was very reminiscent of Audrey Hepburn.

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See Meghan's full look below:

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And again up on the balcony:

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The dark dress was a marked difference from the off-the-shoulder blush number by Carolina Herrera that Meghan chose for her balcony debut at this year's Trooping the Colour. Despite an outcry on social media suggesting that she was breaking some unwritten fashion rule, her bare shoulders were nota break in royal protocol.

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Meghan and Kate chatting on the balcony at this year's Trooping the Colour.

After today's full schedule, Meghan and Harry head to Dublin for a two-day official visit. While there, they will attend a Gaelic sports festival, and visit Trinity College to see the Book of Kells, and pay tribute to those who died at the Famine Memorial. The Duke and Duchess of Sussex will also meet with government leaders while in the country.